Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03f2d265123440e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 11:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b3436d315c67622439544878ae0ec2a SHA-1: a6956d4caf9145f6e2d0990f97099640a3933d78 SHA-256: f03f2d265123440e8e4f6bc78e7b3d3675338ee2d6972e5ced398da081553c55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of many external links points to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08d681ba6---62854927120.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/nanubosimeguritabavawax.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vifijavuvapu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gutatem.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/45766279065.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/65138311604.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/52579292197.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/punepurorow.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/85669694886.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/xikolemukekesuruf.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210925_133818.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/96841830418.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/diboravigusev.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/34773558807.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eef1cbef4---90778624080.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/86142327196.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/23449606195.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/9721311130.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/53008962249.pdfIn PDF document text
    • http://emaaravm.net/upload/files/43738901987.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/3399413567.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/39160557130.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/56931050610.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/815475191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ios+bluetooth+file+transferPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 17504 bytes
SHA-256: 7ae824753e290b94fb5f1909c406b167c12493845ea9831013c374366cbcf43b
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 10504 bytes
SHA-256: 1ab145f5293b478a1f5e0dcb469cbf7523f0e13bbc9ad7986d7b63a97f065186

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